Hangers for well tubing extensions and the like



J. V` FREDD July 9, 1957 HANGERS FOR WELL TUBING EXTENSIONS AND THE LIKE5 Sheets-Sheet l Filed April 6, 1953 JOHN lf. FREUD INVENTOR.

lll.

ATTORNEY July 9, 1957 J. v. FREDD 2,798,559

HANGERS FOR WELL TUBING EXTENSIONS AND THE LIKE Filed April 6,'1953 3Sheets-Sheet 2 f7 /Wf if@ 9 @we 2f m l /M Fig. 9

Fig. /0 l fa Fig. 5 5,4 M

JHN V. FREUD IN V EN TOR.

BY ma@ XM A TTORNE Y J. V. FREDD July 9, 1957 HANGERS FOR WELL TUBINGEXTENSIONS AND THE LIKE Filed April 6. 1953 3 Sheets-Sheet 3 INI/'ENTOR.

TTRNE Y JOHN V. FRED@ 2,798,559 HANGERS FOR WELL TUBING EXTENSINS ANDTHE LIKE .lohn V. Fredd, Dallas, Tex., assignor to Otis EngineeringCorporation, Dallas, Tex., a corporation of Texas Application April 6,1953, Serial No. 346,974 8 Claims. (Cl. 16d-42S) This invention relatesto new and useful improvements in well devices, and more particularly tohangers for well tubing extensions and the like.

A well completion process, which is currently in use, permits thedrilling rig to be removed from the well site after the well casing hasbeen run and cemented to bottom, the tubing and packer set in place andthe well head connections installed, after which perforation of theselected producing formation may be accomplished by means of a smalldiameter perforating gun lowered through the tubing to the selectedlevel to permit flow from such formation. It is then desirable toinstall a length of extension tubing which may consist of a number ofjoints of pipe and may have a length as great as 500 feet or more. Theextension is lowered through the well tubing in place in the well andconnected to the lower end of such tubing by an anchoring and supportingdevice which also seals between the extension tubing and the well tubingso that the lower end of the extension tubing is positioned adjacent theproducing formation. The hanger of the present invention is particularlyadapted for use as a supporting and sealing and anchoring device forconnecting the extension tubing to the lower end of the well tubing inplace in the well.

It is also desirable that the extension tubing be removable from thewell tubing in order that other operations, such as squeeze cementing toseal off improperly located perforations or an undesirable producingformation may be performed, and to permit subsequent reperforation ofthe casing, cement and Well formation at a different level. After suchreworking of the well has been completed with the well tubing and packerremaining in place in the well during such operation, the extensiontubing is again lowered through the well tubing and anchored in place inthe lower end of such well tubing to provide a conduit communicatingwith the bore of the well adjacent the porducing formation. Hence thehanger for the extension tubing must be readily removable andreplaceable and must be capable of supporting substantial weights due tothe length of the extension tubing carried thereby.

lt is an important object of the invention to provide a new and improvedanchoring device adapted for use in a well flow conductor to supportsubsurface well devices in predetermined position in the well ilowconductor.

Another object of the invention is to provide an improved device forreleasably anchoring well devices in a well flow conductor, theanchoring device having selector means for stopping downward movement ofthe anchoring device at a predetermined position in the well ilowconductor and releasable locking means for preventing upward movement ofthe anchoring device from the predetermined position.

A further object of the invention is to provide, in a device of the typedescribed, means for actuating the locking means into locking positionby downward jars or blows delivered to the actuating means and forreleasing the locking means from locking position upon the exertion ofan upward force upon the actuating means.

A still further object of the invention is to provide an anchoringdevice for use in a well llow conductor, having a plurality ofvertically spaced longitudinal grooves, and provided with a selector keyengageable in a selected pair of the annular grooves to limit downwardnied States Patent movement of the anchoring device and also providedwith dogs expansible into another of the grooves by a dog expander upondownward movement of the latter relative to the dogs.

Another object of the device is to provide the selector key with aplurality of lateral apertures whereby any foreign material presentbetween the key and the anchoring device may be removed.

Still another object of the invention is to provide the anchoring devicewith a running tool to which it is releasably connected, and wherein therunning tool cannot be detached from the anchoring device until the dogcarrier has fully expanded the dogs into locking position.

Further objects and advantages of the invention will readily be apparentfrom the reading of the following description of devices constructed inaccordance with the invention, and reference had to the accompanyingdrawings thereof, wherein:

Figure l is a view, partly in elevation and partly in section, of a wellilow conductor having a plurality of landing nipples and showing theanchoring device of the invention locked in position in a selectedlanding nipple,

Figure 2 is a View, partly in elevation and partly in section, of theanchoring device locked in position in a landing nipple forming asection of a well flow conductor,

Figure 3 is a horizontal sectional View taken on the line 3-3 of Figure2,

Figure 4 is a horizonal sectional view taken on the line 4-4 of Figure2,

Figure 5 is an enlarged view, partly in section and partly in elevation,of the anchoring device showing it passing downwardly through a wellflow conductor,

Figure 6 is a fragmentary view, partly in elevation and partly insection, of an anchoring device `constructed in accordance with theinvention and showing the same connected to a running tool for loweringinto a well iiow conductor,

Figure 7 is a side elevation of the selector key carrier showing thelower portion of one selector key in position in said carrier,

Figure 8 is a sectional view taken on the line 8-8 of Figure 7,

Figure 9 is a fragmentary partly sectional view of a modilied form ofthe anchoring device,

Figure 10 is a fragmentary sectional view of two elements of themodified form of the anchoring device shown in Figure 9,

Figure l1 is a perspective view of one of the locking elements of theanchoring device, and

Figure l2 is a side elevation ofthe dog expander shown in assembledposition in Fig. l.

In the drawings, the numeral 10 designates an elongate mandrel having anupper section 11 and .a lower section 12 and a central bore 13. Thelower end portion 14 of the upper mandrel section is enlarged andinternally threaded to receive the externally threaded upper end portionof the lower mandrel section. A positioning or locating assembly ismounted on the lower mandrel section and includes a key carrier 15 and aplurality of selector keys 16. The key carrier comprises a pair ofspaced annular members 17 joined by a pair of connecting ribs 1S and 19,the lower annular surface 20 of the lower annular member i7 resting onthe annular .shoulder 21 of the lower mandrel section.

The annular members 17 of the key carrier have a plurality of opposedvertical guide slots 22 in which are received the studs or guides 23 ofthe selector keys 16, the guides and guide slots cooperating to permitoutward and inward movement of the selector keys perpendicular to thelongitudinal axis of the mandrel into expanded andretracted positionsThe selector keys are biased outwardly by springs 24. Each of thesprings has an inner curved portion which bears against a reducedportion or outer groove 26 of the lower mandrel section,V a bightportion Z7 disposed between the lower mandrel section and its adjacentkey, andan outturned end portion 28 which projects into a lateralaperture 29 of the key. It will be apparent that the springs urge orbias the keys outwardly away from the mandrel, and that springs of otherforms than that shown may be employed for the purpose.

Each key is provided with an internal groove or recess 30 which ispositioned in aligned relation with the outer groove 276 of the lowermandrel section and the spring 24 is disposed in and between these twogrooves. The two grooves are formed in the lower mandrel section and inthe keys to provide sufficient operating room for the springs. Y

The upper and lower ends of the keys are provided with inwardly beveledsurfaces 31 and 32 which tend to camthe keys inwardly when they comeinto contact with obstructions as the anchoring device is moved througha well How conductor.

Each of the keys is also provided with an external groove 33 which formsa downwardly facing stop shoulder 34 extending substantiallyperpendicularly to the longitudinal axis of the mandrel and a beveled ortapered upwardly facing surface 35 which extends outwardly anddownwardly. The external groove of each key divides the outer portion ofthe key into an upper key portion 36 and a lower boss portion 37. Thevertical or longitudinal dimensions of the key portion and the bossportion of the keys of each anchoring device are so chosen that the keysmay move outwardly into expanded position in the well ow conductor onlywhen these portions of the keys are aligned with corresponding annularkey grooves 38 and 39 of like dimensions and configuration in aparticular landing nipple 40 connected in a well ow conductor or string.

The key groove 38 of the landing nipple defines an annular upwardlyfacing shoulder 41 which is adapted to engage the downwardly facing stopshoulders 34 of the keys when they are in expanded position to stopfurther downward movement of the anchoring device through the landingnipple. The beveled surface 35 of the boss portion and the beveledsurface 31 of the key portion of the keys are adapted to carry the keysinwardly by engagement with the annular beveled surfaces 42 and 43,defined by the internal key grooves 39 and 88 of the landing nipple,when the anchoring device is moved upwardly in the landing nipple. Itwill thus be seen that the keys serve to stop or limit downward movementof the anchoring device through the well iiow conductor but permitupward movement of the device.

Each of the keys is provided with a plurality of lateral ports 44 aswell as the lateral aperture Z9 and an inwardly and upwardly extendingaperture 45a whose function will be explained below.

YIn order to permit the anchoring device to be selectively locked insuch predetermined position against upward movement, a plurality ofexpansible locking members or dogs 45 are mounted on the upper mandrelsection for movement into an annular internal locking groove 46 providedin the landing nipple 40. The dogs have hooks 47 at their upper endswhich extend into an lannular groove 48 in a dog holder 49. The dogholder is substantially tubular in form and is internally threaded atits lower end portion onto the externally threaded enlarged portion 14of theupper mandrel section 11. The dog holder is provided with aplurality of longitudinally extending circumferentially spaced slots 50in which are disposed outwardly extending bosses 51 of the dogs 45. Thelower end portions of the slots 50 are defined by end surfaces 52 whichare aligned with the annular stop surface 53 formed by the enlargedportion 14 of the upper mandrel section.

The bosses 51 of the dogs are provided with downwardly and inwardlyextending beveled camming surfaces or shoulders 54 which are engaged byupwardly and outwardly beveled lower surfaces 55 of a dog expander 56.The dog expander has an upper tubular sleeve portion 57 slidably mountedon the upper mandrel section and a lower enlarged split or colletportion 58 having slots 59 in which the Shanks 60 of the dogs aredisposed.

The collet portion has an enlarged lower portion 61 which providesoutwardly and downwardly inclined or beveled shoulders 62 which areadapted to engage the internal annular shoulder 63 of the dog holder tolimit upward longitudinal movement of the dog expander relative to themandrel and the dog holder.

The dogs are moved to expanded positions when the dog expander is moveddownwardly on the upper mandrel section from the position shown inFigure 5 to the position shown in Figure 2.

A packing assembly 64 is mounted on the lower mandrel section above theupper annular member 17 of the key carrier to seal between the mandreland the well ow conductor. The packing assembly is disposed between theupper annular surface 65 of the upper annular member 17 and the lowerannular surface l66 formed by the extreme lower enlarged portion 67 ofthe upper mandrel section.

The anchoring device is lowered into a welltiiow conductor by a runningtool R which includes a skirt 68 having an inwardly extending annularflange 69 on its upper end. A sub 70 extends into the skirt and issecured thereto by a shear pin 71 which extends through aligned lateralapertures 72 and 73 in the sub and in the annular flange 69,respectively. The upper end of the sub may be threaded whereby it may beattached to the end of a flexible running line or other loweringmechanism by a suitable fitting. An intermediate reduced portion 74 ofthe sub is threaded and provided with a retaining nut 75 which abuts theannular flange 69 of the skirt to limit downward movement -of the skirton the sub. The nut may be locked in position by a dowel pin '76. Upwardmovement of the skirt relative to the sub is limited by an annularshoulder 77 of the sub which is adapted to abut the annular flange 69.

The extreme lower end portion 78 of the sub is further reduced andthreaded to engage in the threaded bore 79 of a plug 8l) which mayextend into the central bore 13 of the mandrel 10 to plug it. A sealingring 81 disposed in an annular groove 82 of the plug is provided to'seal between the plug and the mandrel.

The skirt 68 is secured to the dog expander by a pair of shear pins 83and 84 which extend through suitable apertures in the skirt and throughthe parallel grooves 85 and 86 provided on opposite sides of anoutwardly extending fiange 87 on the upper end of the dog expander. Theflange 87 is undercut to provide an upwardly and inwardly inclinedsurface 88 which may be engaged by any suitable fishing tool.

The above described anchoring device and running tool may be used toposition and lock various types of subsurface controls in predeterminedpositions in a well flow conductor or tubing string, which may include aplurality of pipe sections 89 and a plurality of landing nipples 4!)connected in the usual manner by securing together adjacent threadedends of the pipe sections and of the landing nipples. Each nipple 40 ofthe well flow conductor is provided with key grooves 3,8 and 39 whichare of different dimensions or which are differently spaced, than thekey grooves of the other nipples, as is ,clearly seen in Figure l. Theanchoring device is fitted with keys 16 which will match the key groovesof a particular landing nipple in order that the anchoring device may bepositioned and locked in a predetermined point in the well flowconductor in a manner nowV to be described.

In use, a well device, -such as a length of extension tubing 96 issecured to the threaded lower end of the lower mandrel section 12. Theextension tubing 90 may consist of a number of sections and may have alength of as much as 50() feet. The extension tubing extends through thewell flow conductor which is disposed in the well casing 91 and has anopen lower end.

The anchoring device is supported by the running tool R whose skirt 68extends down over the upper end of the dog expander 56 and is securedthereto by the shear pins 83 and 84. The dog expander in turn supportsthe mandrel 1d by the engagement of its shoulder 62 with the annularshoulder 63 of the dog holder 49. In this uppermost position of the dogexpander, the enlarged portion 61 of the dog expander is disposed abovethe bosses 51 of the dogs and the dogs are free to remain in theirretracted positions.

The running tool, the anchoring device and the tubing are then loweredinto the well flow conductor by means of a flexible line or the like, inthe usual manner. The keys 16 are in their retracted positions but arebiased outwardly to contact the inner walls of the well fluid conductorin the manner shown in Figure 5. The beveled surfaces 32 at the lowerends of the keys insure that the keys will be cammed inwardly wheneverthey contact any obstruction, such as the ends of pipe sections, in thewell fluid conductor during downward movement of the anchoring device.

The anchoring device will move downwardly through and past all landingnipples whose key grooves 38 and 39 do not correspond to theconfiguration of the keys 16. When the anchoring device moves downwardlyinto the predetermined landing nipple 40 having the corresponding keygrooves, the keys are moved outward into the key grooves and the stopshoulders 34 of the keys abut the annular shoulder il of the landingnipple. This engagement of the stop shoulders 34 with the annularshoulder 41 prevents further downward movement `of the anchoring deviceand thus positions and supports the anchoring device in a predeterminedposition in vthe well flow conductor, the weight of the anchoring deviceand the tubing now being supported not by the line but by engagement ofthe key stop shoulders with the annular shoulder 41.

The anchoring device, however, is still free to move upwardly, since thedogs 45, whose bosses 51 are now aligned with the locking groove 46 ofthe landing nipple, are in their retracted positions.` The lower edge ofthe skirt 68 of the running tool will now rest upon the upper end of thedog holder 49, so that downward jars imparted to the running tool R byraising the tool slightly and then dropping it will cause the shear pin71 to be sheared, allowing the sub 70 to move downwardly through theskirt to cause the retaining nut 75 to abut the upper end lof the dogexpander. Further jarring imparted to the sub will cause downward blowsto be` imparted` to the upper end of the dog expander by the retainingnut, causing the shear pins 83 and 84 to be sheared to detach therunning tool from the dog expander.` Still further jarring will nowcause the dog expander to move downwardly relative to the mandrel, thedog holder and the dogs. During this downward movement of the dogexpander, the beveled surface 55 at the lower end of the dog expanderengages the corresponding beveled shoulders or surfaces 54 of the dogs,causing the dogs to pivot outwardly so that the bosses 51 extend intothe locking groove 46 of the Vlanding nipple. holds the dogs in expandedposition. The dogs now prevent displacement of the anchoring deviceeither upwardly or downwardly, so that pressure differentials exerted ineither direction across the packing 64 will have no effect on theanchoring device which is held firmly in place so that the extensiontubing 90 is supported in a predeter mined position in the well flowconductor with its lower end extending below the lower open end of thewell flow conductor. r1`he running tool may then be withdrawn up wardly.leaving the anchoring device in position in the The dog expanderl 6 wellflow conductor. It will be noted that the anchoring device was locked inplace solely by downward jarring action, upward jarring action beingprecluded by the fact that the keys prevent only downward movement ofthe anchoring device so that any upward jarring would displace thedevice from the landing nipple.

(not shown) is also provided which allows duid flow v downwardly throughthe annulus into the well flow conductor above the packer but below theanchoring device. Cement is then pumped down the well fluid conductorand through the extension tubing from whose lower end it flows into thewell bore and is forced into the perforations under pressure exertedfrom the surface. The back flow check valve is used primarily to preventback flow of cement from between the well flow conductor or tubing andthe small extension tubing 9i) to the annular space lbetween the casingand flow conductor above the packer. Excess cement is then removed fromthe well by pumping water into the annulus at the surface down throughthe check valve into the annular space between the well fluid conductorand the extension tubing and thence upward through the extension tubingland the well flow conductor to the surface.

During this back flushing operation, suicient pressure is exerted in thewell uid conductor that a certain amount of water passes between thepacker assembly 64 and the well flow conductor and thoroughly cleans theanchoring device. The water flows through the apertures in the keys 16and into the space between the keys and the lower mandrel section toremove any cement which may be lodged there. The keys are thus freed formovement into retracted positions. The back flushing operation isperformed only a few minutes after the cementing operation, so that thecement cannot set around the extension tubing and so that any cementlodged behind the keys will not have time to set.

After the back flushing operation is; performed, the anchoring deviceand the extension tubing 9i? are removed from the well tubing bylowering any suitable fishing tool (not shown) through the well illowconductor to engage the surface 88 of the flange 87 on the upper end ofthe dog expander. An upward pull exerted on the upper end of the dogexpander will cause it to move upwardly relative to the dogs to positionthe enlarged portion 61 of the dog expander above the bosses 51 so thatthe dogs will be free to move into their retracted position. Furtherupward movement causes the shoulder 62, of the dog expander to engagethe annular surface 63 of the dog holder so that continued upwardmovement of the fishing tool will cause an upward pull to be exerted onthe dog holder and therefore on the mandrel. The mandrel will then moveupwardly the upper downwardly and outwardly inclined surfaces 92 of thebosses, thus camming the dogs into retracted position by engagement withthe upwardly and inwardly inclined surface 93 of the locking groove. Atthe same time, the beveled upper surfaces 31 of the keys engage thebeveled annular surface d3 of the landing nipple to cam the keysinwardly to retracted positions. The anchoring device and the extensiontubing 9d can then be lifted to the surface.

In Figures 9 and l() is shown a modified form of the anchoring device inwhich the dog holder lil@ is provided with an arcuate inwardly extendingprojection fdl which is :adapted to engage in the arcuate recesses 192in the outer surfaces of the lower collet portion 164 of the dogexpander 103. The dog expander is formed of metal so that the colletportion 104 thereof may be flexed slightly pander relative to the dogs.`the projections are arcuate in form, a relatively strong `permit upwardmovement of the dog expander.

inwardly by theV arcuate projections as said expander is i moveddownwardlyY in the dog holder from the position L shown in Figure l() tothe position shown in Figure 9, and then outwardly when rthe arcuaterecesses 1M become v aligned with the arcuate projections Ml. Duringthis downward movement, of course, the dogs 10S are moved into expandedpositions.

The projections 101 and the arcuate recesses 1492 cooperate to hold orlock the dog expander to the dog holder to prevent accidental upwarddisplacement of the dog ex- Since both the recesses and upward pullexerted on the dog expander will cause the collet portions MP4 to becammed inwardly to disengage the collet portions 104 from the arcuateprojections and Of course, the dog expander could be provided with anarcuate projection instead of a recess, in which case the dog holderwould be provided with corresponding arcuate recesses. Other parts ofthe dogs, dog holder and dog expander are given the same identifyingnumerals as the form lirst described.

lt will be seen that the projections 101 and the 'arcuate recesses 102serve to rmly secure the dog expander in its lower position wherein itholds the dogs 105 in expanded position to prevent accidental upwarddisplacement of the dog expander.

It will now be apparent that a new and improved anchoring device adaptedfor use in well flow conductors has been provided which includes amandrel having a plurality of selector keys for engagement withcorresponding key grooves in a preselected landing nipple forming 'asection of the conductor for preventing downward movement of theanchoring device past a selected position in the conductor, and having aplurality of dogs movable into expanded locked positions to preventmovement of the mandrel in either upward or downward direction from theselected position. It will also be apparent that a ldog expander hasbeen provided which moves the dogs into expanded positions upon downwardmovement of said dog expander relative to the mandrel. It will also Vbeseen that a running tool has been provided for lowering the Ianchoringdevice into the well flow conductor which has a skirt 63 detachablyconnected to the dog expander and a sub 70 connected to the skirt by ashear pin '72, the shear pin 72 being shearable when the skirt abuts thedog holder 49 to allow the dog expander to be moved downwardly relativeto the skirt only when the anchoring device is properly positioned in apreselected landing nipple 4t) and held against downward movementtherein by the keys 16.

It will also be apparent that the described construction of theanchoring device permits the mandrel to have a central bore of maximumsize whereby an extension tubing 9i) of large size may 'be connectedthereto.

The foregoing description of the invention is explanatory only, andchanges in the details of the construction illustrated may be made bythose skilled in the art, within the scope of the appended claims,without departing from the spirit of the invention.

What I claim and desire to secure by Letters Patent is:

l. A device for releasably anchoring well tools at a selected levelwithin a well pipe comprising: a landing nipple adapted to be connectedin the pipe as a part thereof at said selected level and having internalrecess means therein providing an upwardly facing stop shoulder; amandrel; locking means on the mandrel for radial expansion; expandermeans slidably mounted on saidV mandrel, said locking means and saidexpander means having cooperating surfaces engageable to radially expandthe locking means to locking position upon'downward movement of saidexpander` means relative to said locking means on said mandrel; aselector key mounted on the mandrel; anda resilient element urging thekey outwardly,

saidkey having an upper surface inclined outwardly downwardly -of thelongitudinal axis of the mandrel and -a downwardly facing stop surfacedisposed below the upper surface and-substantially normal to thelongitudinal axis of the carrier; said downwardly facing stop surface ofsaid key being engageable with the upwardly facing stop shoulder in thenipple recessl means to stop downward movement of the mandrel at saidnipple, said inclined upper surface of said key permitting said key tobe moved `upwardly out of said nipple whereby said mandrel may be movedupwardly away from said nipple; said engagement of said stop surface ofsaid key with said stop shoulder in the nipple recess providing the solemeans for stopping downward movement of the mandrel and supporting saidlocking means while said expander means is moved downwardly to move saidlocking means to expanded locking position, said expander means beingmovable downwardly to expand said locking means only after suchengagement of said downwardly facing stop surface of said key with theupwardly facing stop shoulder in the nipple, such expanding .movementbeing effected without disengaging said downwardly facing stop surfaceof the key from the upwardly facing stop shoulder in the nipple.

2. Anchoring device for releasably anchoring well tools at a selectedlevel within a well ow conductor having a plurality of longitudinallyspaced landing nipples each provided with longitudinally spaced annulargrooves, some of the grooves of each landing nipple differing indimensions and conguration from corresponding grooves of the otherlanding nipples, one groove of each landing nipple having an upwardlyfacing stop shoulder, comprising: f a mandrel movable through saidconductor and having locking dogs movable outwardly to engage in one ofthe grooves not having said stop shoulder; a key having projectionsadapted to engage in a pair of grooves'of a preseletcedk one of saidlanding nipples, said key being carried by said mandrel and movableoutwardly to engage in the grooves of the preselected landing nipple,said key having a stop portion engageable with said stop shoulder of thepreselected landing nipple to arrest downward movement of the carrier;and expander means slidable downwardly on said mandrel for moving saiddogs outwardly; said expander means being movable downwardly to move thedogs outwardly to locking position only after downward movement of themandrel is arrested by engagement of the key stop portion with the stopshoulder of the preselected landing nipple, such engagement of the keystop portion with the landing nipple stop shoulder holding the mandreland locking dogs against downward movement to :permit such downwardmovement of the expander means relative to said locking dogs.

3. An anchoring device including: an elongate mandrel having a tubulardog holder mounted exteriorly thereof and concentric with thelongitudinal axis of said mandrel, said dog holder having a plurality oflongitudinally extending slots; a plurality of dogs swingably carried bysaid dog holder and having outwardly extending bosses movable outwardlyof said dog holder through said slots; a dog expander slidably mountedon said mandrel and having aportion movable between said mandrel andsaid dogs and said dog holder; cooperating means on said dog expanderand said dogs for expanding said dogs outwardly when said dog expanderis moved downwardly on said mandrel; cooperating means on said dogvexpander and said dog holder `for limiting upward movement of said dogexpander relative to said dog holder; and a key carried by said mandreland resiliently biased laterally outwardly therefrom, said key having aprojection providing a -downwardly facing stop shoulder adapted toengage an upwardly facing stop shoulder in a well flow conductor to stopdownward movement of said mandrel therein; said dog expander beingmovable downwardly on-the mandrel to move said cooperating means on saiddog expander and said dogs into cooperating engagement only afterdownward movement of said mandrel has been stopped by said stop'shoulder of said key and while said stop shoulder of said key is soengaged with said stop shoulder of said tubing.

4. In combination with the device of claim 3, a running tool having askirt detachably secured to said dog expander and extending thereover,the lower edge of said skirt being `adapted to engage the upper end ofsaid dog holder; a sub mounted for limited movement in the skirt; andshearable means for holding said sub immovable relative to said skirt,said sub being rendered movable relative to said skirt upon jarringimparted to said running tool when said lower end of said skirt abutsthe upper end of said dog holder, said sub being adapted to engage saiddog expander to detach said dog expander from said skirt when said subis rendered movable relative to said skirt.

5. A running tool for an anchoring device of the type describedcomprising: a tubular skirt provided with an aperture for receiving ashear pin for detachably securing said skirt to the anchoring device; asub having a portion extending into said skirt and slidable therein andhaving spaced shoulders providing for limited movement of said sublongitudinally relative to said skirt; and shearable means holding saidsub releasably secured to said skirt with said skirt in its lowermostposition relative to said sub.

6. A well tool adapted for use in a well conductor having internalgrooves providing an internal upwardly facing stop shoulder therein anda downwardly facing lock p shoulder spaced from said stop shoulder, saidtool including: a tubular body; expansible and retractable locking meanson said body engageable with said lock shoulder to lock said body insaid conductor; external sealing means on said body engageable with saidconductor for sealing therebetween; said body having a portion reduced-in external diameter; a stop member mounted on said reduced portion ofsaid body and movable laterally thereof to expanded and retractedpositions, said stop member being arcuate in cross section and having acylindrical external surface provided at its upper and lower ends withoutwardly convergent beveled surfaces, said stop member having anarcuately elongate downwardly facing 'stop shoulder thereon disposed ina plane perpendicular to the cylindrical outer surface of the stopmember, said stop shoulder being engageable with the upwardly facingshoulder of the well conductor for arresting downward movement of saidbody in said conductor, said arcuate cross-sectional shape of said stopmember permitting said stop member to move inwardly of said reducedportion of said body to a retracted position wherein said externalcylindrical surface of said stop member does not project beyond themaximum diameter of said tool; carrier means on said reduced portion ofsaid body and having upper and lower annular members provided withopposed upper and lower guide and retaining slots; upwardly projectingguide and retaining lugs at the upper end of said stop member engageablein corresponding guide and retaining slots in the upper annular memberof said carrier means; downwardly projecting guide and retaining lugs atthe lower end of said stop member engageable in corresponding guide andretaining slots in the lower annular member of said carrier means; meanson said body biasing said stop member to expanded position; said lockingmeans being movable to locking position without disengaging the stopshoulder of the stop member from engagement with the upwardly facingstop shoulder of the well conductor; said guide and retaining lugsengaging said annular members for limiting outward movement of said stopmember.

7. A well tool for treating a well having well tubing positioned thereinwith its lower end open and spaced from the bottom of the bore of thewell, said well tool including: an elongate imperforate tubularconductor member comprising a plurality of elongate imperforateconductor sections detachably connected together and open at the lowerend of the member; means at the upper end of said conductor memberresiliently held in supporting engagement with a selected section ofsaid well tubing for supporting said conductor member at a selectedposition at the lower end of said tubing with the lower end of saidconductor member projecting a substantial distance below the lower openend of said tubing; and means on said conductor member for sealingbetween said conductor member' and said lower end of said well tubingfor conining flow of fluids interiorly of said conductor member betweensaid conductor member and said well tubing, whereby the conductor memberforms a downward extension of the well tubing without requiring movementof the well tubing string; and wherein the means at the upper end of theconductor member for supporting said conductor member at a selectedposition at the lower end of the tubing includes: a landing nippleadapted to be connected in the tubing string `as a part thereof andhaving an internal recess therein providing an upwardly facing stopshoulder; a mandrel connected to the upper end of the tubular conductormember; locking means mounted on the mandrel for lateral movement;expander means, slidably mounted on said mandrel, and engageable withsaid locking means to move said locking means to locking position upondownward movement of said expander means on said mandrel; a selector keymounted for lateral movement on said mandrel and resiliently biasedoutwardly, said selector key having a boss with a downwardly facing stopsurface thereon adapted to engage in the recess of the landing nipplewith said downwardly facing stop shoulder in engagement with theupwardly facing stop shoulder of the landing nipple, such engagementresiliently supporting the mandrel and the elongate conductor againstdownward movement, said expander member being movable downwardly to movesaid locking means to locking position only after said stop shoulder ofsaid key has engaged said stop shoulder in said landing nipple recess,said expander means being movable to move said locking means to lockingposition without disengaging the stop shoulder of the key fromengagement with the stop shoulder in the recess of the landing nipple;said expander member being movable upwardly from engagement with saidlocking means to permit said locking means to move to retractedposition, whereby the conductor member may be removed from the welltubing when desired.

8. A running tool for anchoring devices of the type describedcomprising: a tubular skirt provided with an aperture for receiving ashear pin for detachably securing said skirt to the anchoring device,the bore of said tubular skirt being enlarged below said aperture tofacilitate movement of said anchoring device in such lower portion ofsaid tubular skirt; `a sub having a portion exten-ding downwardly intosaid skirt mounted on said skirt for limited movement relative to saidskirt; upper and lower stop means on said sub spaced apart andengageable with said skirt for permitting such limited longitudinalmovement of said sub relative to said skirt; said lower stop means beingdisposed to engage the anchoring device detachably secured to said skirtupon downward movement of said sub in said skirt; and shearable meansholding said sub secured to said skirt in an elevated position with saidskirt engaging said lower stop means, said shearable means beingreleasable to permit said sub to move downwardly in said skirt.

References Cited in the tile of this patent UNlTED STATES PATENTS Re.20,546 Otis Nov. 2, 1937 2,177,172 Crowell Oct. 24, 1939 2,571,478 OtisOct. 16, 1951 2,636,563 Rollins Apr. Z8, 1953 2,673,614 Miller Mar. 30,1954 2,698,056 Marshall et al Dec. 28, 1954

